a thermometer read - 17° f at 1:00 am. by 2:30 am the temperature has dropped 9.1 degree f. what was the temperature at 2:30 am?

The temperature was - 26.1° f at 2:30 am.

Step-by-step explanation:

* In this type of problems, we must think about

- What is the meaning of wards;

above and below or

raised and dropped or

increased and decreased

- For above, raised, increase

we will add the value of them to the initial value

- For below, dropped, decreased

we will subtract the value of them from the initial value

* In our problem:

- The reading of thermometer is - 17° f at 1:00 am.

- The temperature has dropped 9.1° f when the time was 2:30 am.

* Lets use the explanation above

- We will subtract 9.1 from - 17

∴ - 17 - 9.1 = - 26.1° f

* The temperature was - 26.1° f at 2:30 am.